Changes have been made so that Canon i-SENSYS MF4320d printers not supported by macOS Sierra v10.12/OS X El Capitan v10.11/OS X Yosemite v10.10/OS X Mavericks OS X v10.9 will be deleted when installing the Canon i-SENSYS MF4320d printer driver on those operating systems.If the Canon i-SENSYS MF4320d printer you are using has been deleted, please add it again.